90640744 has 8 divisors (see below), whose sum is σ = 169951410. Its totient is φ = 45320368.

The previous prime is 90640727. The next prime is 90640751. The reversal of 90640744 is 44704609.

It can be written as a sum of positive squares in only one way, i.e., 90060100 + 580644 = 9490^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5665039 + ... + 5665054.

Almost surely, 2^90640744 is an apocalyptic number.

It is an amenable number.

90640744 is a deficient number, since it is larger than the sum of its proper divisors (79310666).

90640744 is a wasteful number, since it uses less digits than its factorization.

90640744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11330099 (or 11330095 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 90640744 is about 9520.5432618102. The cubic root of 90640744 is about 449.2014545650.

The spelling of 90640744 in words is "ninety million, six hundred forty thousand, seven hundred forty-four".